Allen-Bradley 1769-PA2 is a dedicated single-slot AC input expansion power supply module for 1769 CompactLogix automation systems. Designed to supplement insufficient backplane power of main controllers, it supports wide-range industrial AC voltage input and provides dual independent 5VDC backplane power and 24VDC auxiliary power output. It is the core power expansion solution for high-quantity I/O rack systems and large-scale CompactLogix cabinet upgrade projects.

Core Technical Parameter Specifications

Module Type：1769 Compact I/O AC expansion power supply

AC Input Voltage：85–265VAC wide industrial universal voltage

Input Frequency：47–63Hz full-range industrial frequency adaptation

Backplane Output：5VDC / 2.0A stable rack bus power supply

Auxiliary Output：24VDC / 0.8A non-isolated external auxiliary power

Max I/O Expansion Capacity：Supports up to 16 additional I/O modules (8 modules per side)

Max Inrush Current：25A @ 132VAC instantaneous startup current

Insulation Grade：Reinforced insulation, 2596VDC 1s withstand voltage

Rated Power：100VA standard industrial power rating

Wiring Specification：22–14 AWG copper wire for industrial wiring

Operating Altitude：Up to 2000m industrial altitude adaptation

Operating Temperature：0℃ ~ +60℃ continuous stable operation

Certifications：UL, CSA, CE, Class I Div 2 hazardous location compliance

Wide-Voltage AC Input & Dual-Path Stable Power Supply Performance

The core advantage of 1769-PA2 lies in its wide-range universal AC input and dual independent output design. The 85–265VAC ultra-wide voltage range perfectly adapts to unstable grid voltage in old factories and complex industrial environments, avoiding power supply shutdown or voltage fluctuation failures caused by grid deviation.

It provides two sets of functional power outputs simultaneously: high-power 5VDC/2.0A dedicated for controller backplane and I/O module bus power supply, ensuring stable operation of high-density stacked I/O racks; 24VDC/0.8A auxiliary output can supply power for on-site small sensors, indicator lights and low-power auxiliary equipment, eliminating the need for additional external power adapters. Built-in overcurrent, overvoltage and short-circuit protection mechanisms effectively protect the entire rack equipment from power faults.

High-Capacity Rack Expansion & System Retrofit Advantages

Standard CompactLogix CPU backplane power is limited and cannot support large-scale I/O expansion. The 1769-PA2 solves this industry pain point perfectly, expanding the system to support up to 16 extra I/O modules, greatly improving the rack’s load capacity. It adopts a standard single-slot compact structure, occupying no extra cabinet space and maintaining neat cabinet layout.

Fully compatible with all 1769-series I/O modules and L2x/L3x CompactLogix controllers, it supports plug-and-play installation without program modification or cabinet reconstruction. It is the preferred power expansion accessory for old factory automation system upgrades, high-density I/O cabinet renovations and multi-station equipment expansion projects, effectively improving system stability and expandability while reducing overall engineering costs.

Industrial Application Scenarios

AllenBradley 1769-PA2 is widely deployed in CompactLogix system projects requiring high-density I/O expansion and power supplementation, including automated assembly lines, high-speed packaging equipment, logistics sorting systems, environmental protection monitoring equipment and medium-sized process control automation racks.

North American automation OEMs adopt 1769-PA2 for standardized high-density I/O rack power matching design. Latin American manufacturing factories deploy the module to solve insufficient backplane power of old PLC racks. European intelligent manufacturing projects rely on its wide-voltage stability and dual-output function to build reliable and expandable industrial power supply systems.